Hair coloring is used to provide natural color to the gray hair. It is also used to change the hair color shade to some thing different that is more fashionable and desirable.
It can also be used to return hair to its original color after it has been discolored by use of chemicals. Hair coloring is classified into temporary, semi-permanent, demi-permanent and permanent.
Temporary hair color will last for one wash only. It is used for special occasions where one can choose unusual shades for specific events. The pigment molecules are large and cannot penetrate the cuticle layer. This can be removed with singe shampooing.
Semi-permanent hair dye has smaller molecules and it can partially penetrate the hair shaft. This can survive 4 to 5 shampoos. This does not contain developer or ammonia. The final color of each strand of hair depends on original color and porosity. This will have variations of shade across the head. Gray and white hair will not dye to the same extent as the natural color hair. Hence gray hair cannot be hidden. If the gray hairs are few, then it will blend with the rest of the hair. When the gray hairs are more it is not possible to hide them.
Demi-permanent hair color uses a low volume developer. Only color molecules penetrate the hair shaft. They are more effective at covering grey hair than semi-permanent hair color. They are gentler on the hair hence safer. This color will remain for 20 to 28 shampoos. Hence, change of color is possible to achieve which is not so in case of permanent hair color.
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